User equipment management limiting transmit output power in protection zones

ABSTRACT

A method, computer-readable medium, and apparatus operate to reduce or eliminate interference with one or more other communication systems having specific transmission requirements within a specific geographic area. For example, aspects operate by determining that a user equipment (UE) is in a protection zone where additional transmission requirements apply. The additional transmission requirements enable coexistence with one or more other communication systems in the protection zone. The UE may identify, based on being in the protection zone and a coexistence mode, one or more transmit emission limit requirements to be met. The UE may identify, based on being in the protection zone and the coexistence mode, one or more maximum transmit power requirements to be met. The UE may configure a transmit output power, at which the UE can meet the one or more transmit emission limit requirements and the one or more maximum transmit power requirements.

CLAIM OF PRIORITY UNDER 35 U.S.C. § 119

This application claims priority to U.S. Provisional Application No.62/402,750, titled “USER EQUIPMENT TRANSMISSION MANAGEMENT FORDYNAMICALLY VARYING TRANSMISSION EMISSION REQUIREMENTS,” filed Sep. 30,2016, which is assigned to the assignee hereof, and incorporated hereinby reference in its entirety.

INTRODUCTION

Aspects of the present disclosure relate generally to wirelesscommunications systems, and more particularly, to apparatus and methodsof managing transmissions of a user equipment to meet dynamicallyvarying transmission emission requirements in wireless communicationssystems.

Wireless communications systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communications systems may employmultiple-access technologies capable of supporting communications withmultiple users by sharing available system resources (e.g., time,frequency, power, and/or spectrum). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency division multipleaccess (FDMA) systems, orthogonal frequency division multiple access(OFDMA) systems, single-carrier frequency division multiple access(SC-FDMA) systems, and time division synchronous code division multipleaccess (TD-SCDMA).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis Long Term Evolution (LTE) or LTE-Advanced (LTE-A). However, althoughnewer multiple access systems, such as an LTE or LTE-A system, deliverfaster data throughput than older technologies, such increased downlinkrates have triggered a greater demand for higher-bandwidth content, suchas high-resolution graphics and video, for use on or with mobiledevices. As such, demand for bandwidth, higher data rates, bettertransmission quality as well as better spectrum utilization, and lowerlatency on wireless communications systems continues to increase. Inresponse, a 5th Generation (5G) New Radio (NR) communicationstechnology, used in a wide range of spectrum, is envisaged to expand andsupport diverse usage scenarios and applications with respect to currentmobile network generations.

One usage scenario supported by LTE and/or NR communication technologyrelates to intelligent transportation systems (ITS), includingvehicle-to-vehicle (V2V) and/or vehicle-to-X (where X represents someother device or some other technology) communications. In someinstances, communications associated with ITS can interfere with othercommunication systems, such as road tolling stations. As such,improvements in communications in such scenarios may be desired.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its purpose is to presentsome concepts of one or more aspects in a simplified form as a preludeto the more detailed description that is presented later.

According to an example, a method related to managing transmissions of auser equipment, e.g., to reduce or eliminate interference with one ormore other communication systems having specific transmissionrequirements within a specific geographic area, is provided. The methodincludes determining, by a processor of the UE, that the UE is in aprotection zone where additional transmission requirements apply, theadditional transmission requirements enabling coexistence with one ormore other communication systems in the protection zone. The methodincludes identifying, by the processor and based on being in theprotection zone and a coexistence mode, one or more transmit emissionlimit requirements to be met. The method includes identifying, by theprocessor and based on being in the protection zone and the coexistencemode, one or more maximum transmit power requirements to be met. Themethod includes configuring, by the processor, a transmit output power,at which the UE can meet the one or more transmit emission limitrequirements and the one or more maximum transmit power requirements.

In another example, a user equipment apparatus includes a transceiver, amemory configured to store instructions, and one or more processorscommunicatively coupled with the transceiver and the memory. The one ormore processors may be configured to determine that the UE is in aprotection zone where additional transmission requirements apply, theadditional transmission requirements enabling coexistence with one ormore other communication systems in the protection zone. The one or moreprocessors may be configured to identify, based on being in theprotection zone and a coexistence mode, one or more transmit emissionlimit requirements to be met. The one or more processors may beconfigured to identify, based on being in the protection zone and thecoexistence mode, one or more maximum transmit power requirements to bemet. The one or more processors may be configured to configure, by theprocessor, a transmit output power, at which the UE can meet the one ormore transmit emission limit requirements and the one or more maximumtransmit power requirements.

According to a further example, a UE may include means for determiningthat the UE is in a protection zone where additional transmissionrequirements apply, the additional transmission requirements enablingcoexistence with one or more other communication systems in theprotection zone. The UE may include means for identifying, based onbeing in the protection zone and a coexistence mode, one or moretransmit emission limit requirements to be met. The UE may include meansfor identifying, based on being in the protection zone and thecoexistence mode, one or more maximum transmit power requirements to bemet. The UE may include means for configuring a transmit output power,at which the UE can meet the one or more transmit emission limitrequirements and the one or more maximum transmit power requirements.

In yet another example, a computer-readable medium storescomputer-executable code executable by one or more processors toconfigure a transmit output power of a UE. The computer-readable mediummay include code to determine that the UE is in a protection zone whereadditional transmission requirements apply, the additional transmissionrequirements enabling coexistence with one or more other communicationsystems in the protection zone. The computer-readable medium may includecode to identify, based on being in the protection zone and acoexistence mode, one or more transmit emission limit requirements to bemet. The computer-readable medium may include code to identify, based onbeing in the protection zone and the coexistence mode, one or moremaximum transmit power requirements to be met. The computer-readablemedium may include code to configure a transmit output power, at whichthe UE can meet the one or more transmit emission limit requirements andthe one or more maximum transmit power requirements.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to facilitate a fuller understanding of aspects describedherein, reference is now made to the accompanying drawings, in whichlike elements are referenced with like numerals. These drawings shouldnot be construed as limiting the present disclosure, but are intended tobe illustrative only.

FIG. 1 is a schematic diagram of one implementation of a wirelesscommunication system including a UE having a coexistence transmissionmanager component configured to reduce or eliminate interference withone or more other communication systems having specific transmissionrequirements within a specific geographic area;

FIG. 2 is a flowchart of one implementation of a method of managingtransmissions of a user equipment, such as may be performed by the UE ofFIG. 1 executing the coexistence transmission manager component asdescribed herein; and

FIG. 3 is a graph of power versus operational mode (e.g., normal modeand co-existence mode) with respect to applying an allowed maximumtransmit output power reduction in one implementation of a wirelesscommunication system.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known components are shown in blockdiagram form in order to avoid obscuring such concepts. Additionally,the term “component” as used herein may be one of the parts that make upa system, may be hardware, firmware, and/or software, and may be dividedinto other components.

Described herein are various aspects related to a wirelesscommunications system (e.g., LTE, 5G NR), in particular, to apparatusand methods of managing transmissions of a user equipment (UE) to meetdynamically varying transmission emission requirements associated with aprotection zone within one or more areas of a geographic region.Specifically, the present disclosure includes a UE having a coexistencetransmission management component that is configured to determine, basedon the UE being within a protection zone, if additional transmissionrequirements apply to enable coexistence with one or more othercommunication systems in the protection zone. Further, the coexistencetransmission management component is configured to identify transmitemission limit requirements and maximum transmit power requirements tobe met based on the geographic location of the UE and a coexistence modeassociated with the one or more other communications systems.Additionally, the coexistence transmission management component isoperable to configure a transmit output power, u at which the UE canmeet the emission requirements.

In one aspect, the coexistence transmission management component isconfigured to determine, based on the transmit emission limitrequirements and the maximum transmit power requirements, an allowedmaximum transmit output power reduction (which may be referred to asD-MPR) that can be utilized by the UE to meet the emission requirements.In an alternative or additional aspect, a total power backoff allowancefor the UE is a sum of a maximum power reduction (MPR; e.g., as definedby an LTE specification)+an additional MPR (A-MPR; as defined by an LTEspecification)+the allowed maximum transmit output power reduction (asdefined herein).

In one aspect, the determination of applicability of additionaltransmission requirements is based on additional information provided bya serving eNodeB and/or is preconfigured in the UE.

For example, one implementation of this disclosure relates to managingtransmissions of a UE operating within an intelligent transportationsystem (ITS), such as for V2V or V2X communications, to enablecoexistence with a Transport and Traffic Telematics (TTT) system (e.g.,a road tolling system, also known as a European Committee forStandardization (CEN) dedicated short range communication (DSRC) roadside unit (RSU)). In Europe (Region 1), 5855-5925 MHz is allocated forITS services and has to coexist with CEN DSRC RSUs operating in5795-5815 MHz. Due to the short separation of the frequency rangebetween the ITS band and CEN DSRC band, there are tighter emissionrequirements for ITS stations to avoid harmful interference to CEN DSRCRSUs. CEN DSRC communication is localized around the RSUs, also known asroad tolling stations, such as in a tolling zone associated with eachRSU (see, e.g., tolling zone 22 associated with RSU 14 in FIG. 1).

For this reason, each tolling zone is associated with a protection zone(see, e.g., protection zone 16 in FIG. 1) surrounding the RSU, where theprotection zone is designed to protect the RSU from harmful interferencefrom ITS stations. The ITS station then operates in two modes: normalmode outside the protection zone and coexistence mode within theprotection zone. In normal mode, there are no additional requirements onthe ITS station required for coexistence with CEN DSRC. In coexistencemode, the ITS station has to meet tighter requirements to avoidinterference to CEN DSRC. Further, different coexistence modes arepossible based on transmit power and transmit duty cycle constraints:

In normal mode, the emission requirement in CEN DSRC band is −30dBm/MHz, and there are no further constraints on duty-cycle/transmitpower.

In coexistence mode: From ETSI TS 102 792, Table 5.3:

TABLE 5.3 Coexistence modes ITS output power level ITS unwantedemissions in the frequency range in the frequency range Coexistence 5855 MHz to 5 925 MHz 5 795 MHz to 5 815 MHz mode (dBm EIRP) (dBm/MHzEIRP) T_(on) time T_(off) time A ≤10 ≤−65 no limit no limit B ≤10 ≤−45≤1 ms ≥50 ms C ≤33 ≤−30 ≤1 ms equation 5.1 D ≤33 ≤−30 1 ms to 7 msequation 5.2

In view of the foregoing, problems associated with ITS stationscomplying with CEN DSRC are summarized as follows:

-   -   1. ITS stations have to meet the tighter requirements for        coexistence with CEN DSRC.    -   2. The requirements are regional (Europe).    -   3. The requirements are dynamic, e.g. a car driving through the        road tolling station will have no additional requirements when        far from the tolling station, then have tighter requirements        when in the protection zone, and then again back to normal mode        when it moves away.    -   4. The requirements in protection zone further depend on the        coexistence mode being used by the UE (i.e. mix of emission        requirements, max transmit (tx) power, and duty cycle).

In LTE, regional requirements that are tighter than the generalrequirements are indicated to the UE using NS (network signaling; e.g.,an NS value). The eNodeB indicates the NS value to use in the systeminformation block (SIB), and the NS value corresponds to a set oftighter emission requirements defined in the specification (TS 36.101).To meet the tighter requirements, the UE may be allowed to use A-MPR(additional maximum output power reduction) as specified in thespecification. Thus the NS value indicates to the UE the tighteremission requirement, as well as the A-MPR allowance for that case tohelp meet those tighter requirements.

The current NS signaling/A-MPR approach of LTE does not work in a systemhaving hyper-localized and hyper-dynamic transmission requirements, suchas but not limited to the requirements for coexistence with CEN DSRC inan ITS.

For example, the current LTE approach fails to provide an indication ofthe additional requirements for coexistence with CEN DSRC. The intentionfor NS signaling (and the associated A-MPR allowance) is to meetregional requirements that are more static in nature (e.g. applicableover a wide region) and not expected to dynamically become applicablebased on distance from RSUs/tolling stations (e.g., in a protection areaon an order of 100 m from a tolling station). Because of the staticnature of regional LTE requirements, the applicability can be signaledto the UE from a serving eNB or can be pre-configured in a subscriberidentification module (e.g., a universal SIM) with the associatedgeographical area. However, the same approach does not work efficientlyfor the RSU/tolling station case due the hyper-localized andhyper-dynamic nature of the transmission requirements.

Further, for example, the current LTE approach fails to consider a mixof Duty-Cycle+Emissions+transmit (Tx) output power. For instance,regional requirements covered in LTE under NS relate to fixed emissionrequirements independent of the duty cycle of transmission. For the CENDSRC coexistence case, Mode A is of that form. However, Modes B, C, Dare also allowed where the emission requirements differ if the UE istransmitting at lower frequency, etc. So the emission requirement tomeet also depends on the UE implementation of the coexistence mode, andis not fixed as required with NS.

Accordingly, the present disclosure provides a UE with a coexistencetransmission manager component to improve the performance of wirelesscommunications, e.g., to reduce interference with other wirelesscommunications such as but not limited to CEN DSRC.

One or more of the aspects described above may be performed orimplemented in connection with the example implementations of FIGS. 1-3,which are described in more detail below.

Referring to FIG. 1, in an aspect, a wireless communication system 10includes UE 12 having a coexistence transmission management component 13to reduce or eliminate interference with one or more other communicationsystems having specific transmission requirements within a specificgeographic area. For example, the one or more other communicationssystems may be a relatively short range communication system (e.g., ascompared to a range of a wireless wide area network (WWAN)), such as aroad side tolling station or road side unit (RSU) 14 operating accordingto the CEN DSRC standard (e.g., ETSI TS 102 792), including specifictransmission requirements (e.g., ETSI TS 102 792, Table 5.3) in aprotection zone 16 associated with RSU 14. For example, protection zone16 may be an area surrounding RSU 14, including extending a distance(e.g., up to 100 m) in front of RSU 14. In this case, the “front” of RSU14 may be defined as a direction from which a vehicle 18 traveling on aroad 20 (across which RSU 14 is located) is approaching RSU 14.Protection zone 16 may be of any size and shape to provide an area ofprotection around a tolling zone 22 of RSU 14, e.g., in order to reduceinterference with DSRC communications in tolling zone 22 between RSU 14and a toll-related transponder 24 in vehicle 18. For example, tollingzone 22 may be an area that covers a width of road 20, and extends asuitable distance (e.g., 10 m) from the front of RSU 14 to enabletoll-related communications to occur. In an implementation, theprotection zone 16 may be defined by center coordinates and a radius. Inanother implementation, the protection zone 16 may be defined by a setof coordinates (e.g., 4) indicating the corners of the protection zone16.

UE 12 may be movably located in and out of protection zone 16, such aswhen UE 12 is located within vehicle 18. Due to the relatively smallsize of the area of protection zone 16 and the velocity at which UE 12may be moving into and out of protection zone 16, according to thepresent disclosure, coexistence transmission management component 13 ofUE 12 may be configured to be particularly suited for highly localizedand highly dynamic operation to allow UE 12 to meet the transmissionrequirements within protection zone 16.

In one implementation, for instance, coexistence transmission managementcomponent 13 may include one or more subcomponents for determining andconfiguring transmission parameters to meet coexistence requirements.

For example, coexistence transmission management component 13 mayoptionally include a location determiner component 28 configured todetermine a geographic location 30 of UE 12. Location determinercomponent 28 may include, for example, a satellite-based and/orterrestrial-based global positioning system (GPS), which may be a partof coexistence transmission management component 13 or which may be aseparate component on UE 12 and in communication with coexistencetransmission management component 13.

Further, for example, coexistence transmission management component 13may include an additional transmission requirement determiner component32 configured to determine whether the UE 12 is in a protection zonewhere additional transmission requirements apply. The additionaltransmission requirements may enable coexistence with one or more othercommunication systems in the protection zone. For example, theadditional transmission requirement determiner component 32 maydetermine, based on geographic location 30 of UE 12, if additionaltransmission requirements apply to enable coexistence with one or moreother communication systems in geographic location 30 by determiningwhether the geographic location 30 is within a protection zone 16. Forexample, in an aspect, additional transmission requirement determinercomponent 32 may determine if geographic location 30 of UE 12 matches orfalls within protection zone 16 of CEN DSRC RSU 14. When UE 12 islocated within protection zone 16, then additional transmissionrequirement determiner component 32 is configured to identify theadditional transmission requirements associated with protection zone 16,such as the coexistence requirements associated with one or morecoexistence modes 34 defined in Table 5.3 of ETSI TS 102 792 for CENDSRC systems. In an implementation, the additional transmissionrequirement determiner component 32 may include a computer-readablemedium (e.g., memory 130) storing code executable by a processor (e.g.,processor 103) to determine, based on geographic location 30 of UE 12,if additional transmission requirements apply to enable coexistence withone or more other communication systems in or near geographic location30.

Further, coexistence transmission management component 13 may include atransmit output power configuration component 36 to dynamicallyconfigure UE transmission parameters, including a transmit output powervalue 38, when additional transmission requirement determiner component32 determines that the UE 12 is within a protection zone whereadditional transmission requirements apply to enable coexistence withone or more other communication systems in geographic location 30.

For instance, transmit output power configuration component 36 mayinclude a transmit emission requirement determiner component 40configured to identify transmit emission requirements to be met in theprotection zone 16. For example, the transmit output power configurationcomponent 36 may identify transmit emission requirements based ongeographic location 30 of UE 12 and coexistence mode 34 associated withthe other communications system in the location. For example, transmitemission requirement determiner component 40 may be configured toidentify transmit emission requirements based on one or more coexistencemodes 34 defined in Table 5.3 of ETSI TS 102 792 for CEN DSRC systems.For example, a maximum allowed output power level may be based on anapplicable coexistence mode. The transmit emission requirementdeterminer component 40 may determine an applicable coexistence mode 34based on an intended transmission. For example, the transmit emissionrequirement determiner component 40 may determine whether an intendedtransmission complies with one or more of the coexistence modes based onprevious transmission parameters or scheduling information for thetransmission.

The transmit output power configuration component 36 may identify, basedon the UE 12 being in the protection zone 16 and a coexistence mode, oneor more transmit emission limit requirements to be met. For example, thetransmit output power configuration component 36 may identify anemission limit on a particular frequency range, such as the 5794-5815MHz band identified by ETSI TS 102 792 for CEN DSRC systems. Thetransmit output power configuration component 36 may identify, based onthe UE 12 being in the protection zone 16 and the coexistence mode, oneor more maximum transmit power requirements to be met. For example, thetransmit output power configuration component 36 may identify a maximumtransmission power. For example, the identified maximum transmissionpower may be a maximum output power level defined by ETSI TS 102 792 forCEN DSRC systems.

Also, for instance, transmit output power configuration component 36 mayinclude a transmit output power reduction determiner component 42configured to determine, based on the transmit emission requirements, anallowed maximum transmit output power reduction or backoff that can beutilized by UE 12 to meet the emission requirements.

Therefore, based on operation of the above-noted components, transmitoutput power configuration component 36 is operable to configuretransmit output power value 38, using the backoff from a maximum outputpower greater than or equal to the allowed maximum transmit output powerreduction or backoff, at which UE 12 can meet the emission requirementsof geographic location 30, e.g., associated with protection zone 16 ofCEN DSRC systems.

The coexistence transmission management component 13 and itssubcomponents may include hardware, firmware, and/or software codeexecutable by a processor for performing transmission powerconfiguration and management operations. For example, the hardware mayinclude, for example, a hardware accelerator, or specialized processor.

In some implementations, UE 12, may be in communication coverage of atleast one network entity 44 (e.g., base station or eNB, or a cellthereof, in a 5G NR network) for providing UE 12 with access to anetwork, such as the Internet. In some aspects, multiple UEs includingUE 12 may be in communication coverage with one or more networkentities, including network entity 44. In an aspect, the network entity44 may be a base station such an eNodeB/eNB in a 5G NR network. Also,network entity 44 may be a macrocell, picocell, femtocell, relay, NodeB, mobile Node B, small cell, UE (e.g., communicating in peer-to-peer orad-hoc mode with UE 12), WiFi router, short range communication (e.g.,Bluetooth, Zigbee) device, or substantially any type of component thatcan communicate with UE 12 to provide wireless network access to the UE12. Although various aspects are described in relation to a UMTS, LTE,or 5G NR network, similar principles may be applied in other wirelesswide area networks (WWAN) and/or wireless local area networks (WLANS).The wireless network may employ a scheme where multiple base stationsmay transmit and/or receive signals on one or more channels. In anexample, UE 12 may transmit and/or receive wireless communications toand/or from network entity 44. In an aspect, the network entity 44 mayprovide the UE 12 with information regarding the locations of protectionzones 16 within the coverage area of the network entity 44. For example,the network entity 44 may broadcast the locations of protection zones 16within a system information block (SIB) or transmit the locations in aconfiguration message.

In some aspects, UE 12 may also be referred to by those skilled in theart (as well as interchangeably herein) as a mobile station, asubscriber station, a mobile unit, a subscriber unit, a wireless unit, aremote unit, a mobile device, a wireless device, a wirelesscommunications device, a remote device, a mobile subscriber station, anaccess terminal, a mobile terminal, a wireless terminal, a remoteterminal, a handset, a terminal, a user agent, a mobile client, aclient, or some other suitable terminology. UE 12 may be a cellularphone, a personal digital assistant (PDA), a wireless modem, a wirelesscommunication device, a handheld device, a tablet computer, a laptopcomputer, a cordless phone, a wireless local loop (WLL) station, aglobal positioning system (GPS) device, a multimedia device, a videodevice, a digital audio player (e.g., MP3 player), a camera, a gameconsole, a wearable computing device (e.g., a smart-watch,smart-glasses, a health or fitness tracker, etc.), an appliance, asensor, a vehicle communication system, a medical device, a vendingmachine, a device for the Internet-of-Things, or any other similarfunctioning device.

According to the present aspects, the UE 12 may include one or moreprocessors 103 and a memory 130 that may define and/or operate incombination with a coexistence transmission management component 13 toperform the dynamic transmission configuration functions as describedherein. For example, coexistence transmission management component 13may be communicatively coupled to a transceiver 106, which may include areceiver 132 for receiving and processing RF signals and a transmitter134 for processing and transmitting RF signals. The processor 103 may becoupled to the transceiver 106 and memory 130 via at least one bus 110.

The receiver 132 may include hardware, firmware, and/or software codeexecutable by processor 103 for receiving data, the code comprisinginstructions and being stored in a memory (e.g., computer-readablemedium). The receiver 132 may be, for example, a radio frequency (RF)receiver. In an aspect, the receiver 132 may receive signals 46transmitted by network entity 44, such as control signals and datasignals on one or more channels. For example, in an aspect, signals 46may include a SIB having an NS value, as described above. Also, in anaspect, the receiver 132 may receive signals 48 transmitted by atransmitter 50 of RSU 14, where signals 48 may include identify RSU 14,protection zone 16, and/or one or more coexistence modes 34 and/orcoexistence requirements associated with protection zone 16.

The transmitter 134 may include hardware, firmware, and/or software codeexecutable by processor 103 for transmitting data, the code comprisinginstructions and being stored in a memory (e.g., computer-readablemedium). The transmitter 134 may be, for example, an RF transmitter.Further, for example, transmitter 134 may operate using a transmitoutput power value 38 set by coexistence transmission managementcomponent 13 in the manner described herein.

In an aspect, the one or more processors 103 can include a modem 108that uses one or more modem processors. The various functions related tocoexistence transmission management component 13 may be included inmodem 108 and/or processors 103. In an aspect, the various functions canbe executed by a single processor, while in other aspects, differentones of the functions may be executed by a combination of two or moredifferent processors. For example, in an aspect, the one or moreprocessors 103 may include any one or any combination of a modemprocessor, or a baseband processor, or a digital signal processor, or atransmit processor, or a transceiver processor associated withtransceiver 106.

Moreover, in an aspect, UE 12 may include an RF front end 104, which insome cases may also be considered to include transceiver 106, forreceiving and transmitting radio transmissions. RF front end 104 may beconnected to one or more antennas 102 and can include one or morelow-noise amplifiers (LNAs) 141, one or more switches 142, 143, one ormore power amplifiers (PAs) 145, and one or more filters 144 fortransmitting and receiving RF signals. In an aspect, components of RFfront end 104 can connect with transceiver 106. Transceiver 106 mayconnect to one or more modems 108 and processor 103.

In an aspect, LNA 141 can amplify a received signal at a desired outputlevel. In an aspect, each LNA 141 may have a specified minimum andmaximum gain values. In an aspect, RF front end 104 may use one or moreswitches 142, 143 to select a particular LNA 141 and its specified gainvalue based on a desired gain value for a particular application.

Further, for example, one or more PA(s) 145 may be used by RF front end104 to amplify a signal for an RF output at a desired output powerlevel. In an aspect, each PA 145 may have a specified minimum andmaximum gain values. In an aspect, RF front end 104 may use one or moreswitches 143, 146 to select a particular PA 145 and its specified gainvalue based on a desired gain value for a particular application.

Also, for example, one or more filters 144 can be used by RF front end104 to filter a received signal to obtain an input RF signal. Similarly,in an aspect, for example, a respective filter 144 can be used to filteran output from a respective PA 145 to produce an output signal fortransmission. In an aspect, each filter 144 can be connected to aspecific LNA 141 and/or PA 145. In an aspect, RF front end 104 can useone or more switches 142, 143, 146 to select a transmit or receive pathusing a specified filter 144, LNA, 141, and/or PA 145, based on aconfiguration as specified by transceiver 106 and/or processor 103.

Transceiver 106 may be configured to transmit and receive wirelesssignals through antenna 102 via RF front end 104. In an aspect,transceiver 106 may be tuned to operate at specified frequencies suchthat UE 12 can communicate with, for example, network entity 44 or RSU14. In an aspect, for example, modem 108 can configure transceiver 106to operate at a specified frequency and power level based on the UEconfiguration of the UE 12 and communication protocol used by modem 108.

In an aspect, modem 108 can be a multiband-multimode modem, which canprocess digital data and communicate with transceiver 106 such that thedigital data is sent and received using transceiver 106. In an aspect,modem 108 can be multiband and be configured to support multiplefrequency bands for a specific communications protocol. In an aspect,modem 108 can be multimode and be configured to support multipleoperating networks and communications protocols. In an aspect, modem 108can control one or more components of UE 12 (e.g., RF front end 104,transceiver 106) to enable transmission and/or reception of signalsbased on a specified modem configuration. In an aspect, the modemconfiguration can be based on the mode of the modem 108 and thefrequency band in use. In another aspect, the modem configuration can bebased on UE configuration information associated with UE 12 as providedby the network, e.g., during cell selection and/or cell reselection.

UE 12 may further include memory 130, such as for storing data usedherein and/or local versions of applications or coexistence transmissionmanagement component 13 and/or one or more of its subcomponents beingexecuted by processor 103. Memory 130 can include any type ofcomputer-readable medium usable by a computer or processor 103, such asrandom access memory (RAM), read only memory (ROM), tapes, magneticdiscs, optical discs, volatile memory, non-volatile memory, and anycombination thereof. In an aspect, for example, memory 130 may be acomputer-readable storage medium that stores one or morecomputer-executable codes defining coexistence transmission managementcomponent 13 and/or one or more of its subcomponents, and/or dataassociated therewith, when UE 12 is operating processor 103 to executecoexistence transmission management component 13 and/or one or more ofits subcomponents. In another aspect, for example, memory 130 may be anon-transitory computer-readable storage medium.

For purposes of simplicity of explanation, the methods discussed hereinare shown and described as a series of acts, it is to be understood andappreciated that the method (and further methods related thereto) is/arenot limited by the order of acts, as some acts may, in accordance withone or more aspects, occur in different orders and/or concurrently withother acts from that shown and described herein. For example, it is tobe appreciated that a method could alternatively be represented as aseries of interrelated states or events, such as in a state diagram.Moreover, not all illustrated acts may be required to implement a methodin accordance with one or more features described herein.

Referring to FIG. 2, in an operational aspect, a UE such as UE 12(FIG. 1) may perform one or more aspects of a method 200 fortransmission management. For example, one or more of the processors 103,the memory 130, the modem 108, and/or the coexistence transmissionmanagement component 13 of UE 12 may be configured to perform aspects ofmethod 200.

In an aspect, at block 202, method 200 may optionally includedetermining a geographic location of the UE. For example, in an aspect,processor 103 executing coexistence transmission management component 13is configured to determine geographic location 30 of UE 12. Forinstance, processor 103 and/or coexistence transmission managementcomponent 13 may include a GPS unit, or may be in communication with aGPS unit located elsewhere in UE 12, where the GPS unit is operable tocompute geographic location 30 of UE 12 based on received satelliteand/or terrestrial signals.

Further, at block 204, method 200 may include determining, by aprocessor of the UE, that the UE is in a protection zone whereadditional transmission requirements apply, the additional transmissionrequirements enabling coexistence with one or more other communicationsystems in the protection zone. For example, in an aspect, processor 103executing coexistence transmission management component 13 and/oradditional transmit (tx) requirement determiner component 32 isconfigured to determine, that the UE 12 is in a protection zone 16 whereadditional transmission requirements apply, the additional transmissionrequirements enabling coexistence with one or more other communicationsystems in the protection zone. For instance, in one implementation,additional transmit (tx) requirement determiner component 32 may includepreconfigured location data that identifies one or more protection zones16 having additional transmission requirements, and may comparegeographic location 30 to the preconfigured location data to determineif a match exists (e.g., if geographic location 30 is within an areadefined by preconfigured location data and/or within a predetermineddistance of a location of an RSU 14). In another implementation, thedetermination of applicability of additional transmission requirementsis based on additional information provided by network entity 44, suchas a serving eNodeB. For example, the network entity 44 may providelocations of one or more protection zones 16 and/or additionaltransmission requirements associated with the one or more protectionzones 16. In another implementation, the determination of applicabilityof additional transmission requirements may be based on additionalinformation provided by a device of the one or more other communicationsystems. For example, the RSU 14 may transmit the signal 48 including anidentification of the RSU 14 or a protection zone 16 associatedtherewith.

Also, at block 206, method 200 may include identifying, by the processorand based on being in the protection zone and a coexistence mode, one ormore transmit emission limit requirements to be met. For example, in anaspect, processor 103 executing coexistence transmission managementcomponent 13 and/or transmit output power configuration component 36,including transmit emission requirement determiner component 40, isconfigured to determine transmit emission requirements to be met basedon based on being in the protection zone 16 and a coexistence mode 34associated with the one or more other communications systems, e.g., CENDSRC RSU 14, at the location. For example, transmit emission requirementdeterminer component 40 may identify one or more coexistence modes 34 asdefined by ETSI TS 102 792, and their corresponding requirements, e.g.,Table 5.3. The transmit emission requirement determiner component 40 maydetermine one or more coexistence modes 34 associated with a particularprotection zone 16 by identifying the one or more other communicationssystems associated with the protection zone 16. For example, a CEN DSRCRSU 14 having the protection zone 16 may be associated with a first setof coexistence modes, and a second communication system may beassociated with a different second set of coexistence modes. Further,the transmit emission requirement determiner component 40 may determineone or more applicable coexistence modes based on an intendedtransmission, for example, as defined by one or more applicablecoexistence modes of ETSI TS 102 792. For example, the transmit emissionrequirement determiner component 40 may performing computations based onequation 5.1 or equation 5.2 for modes C and D, respectively.Toff(C)≥(45×N)) ms  (5.1)Toff(D)≥Toff(C)+15.4×N×(Ton−1 ms)  (5.2)

Toff may be a minimum time between two consecutive transmissions. N maybe an assumed number of interfering ITS stations. For example, the UE 12may estimate N based on geographical networking information. Thetransmit output power reduction determiner component 42 may determinewhether intended transmissions within the protection zone comply withthe Toff requirements of one of modes C and D. If so, the transmitoutput power reduction determiner component 42 may determine the allowedmaximum transmit output power reduction based on the higher output powerlevels of coexistence modes C and D of table 5.3.

Further, at block 208, method 200 may include identifying, by theprocessor and based on being in the protection zone and the coexistencemode, one or more maximum transmit power requirements to be met. Forexample, in an aspect, processor 103 executing coexistence transmissionmanagement component 13 and/or transmit output power configurationcomponent 36, including transmit emission requirement determinercomponent 40, is configured to identify, based on based on being in theprotection zone and the coexistence mode, one or more maximum transmitpower requirements to be met. For instance, transmit output powerconfiguration component 36 may identify the allowed maximum transmitpower based on the output power levels, levels, time on (Ton), and timeoff (Toff) as defined by one or more applicable coexistence modes ofETSI TS 102 792.

Additionally, at block 210, method 200 may include configuring, by theprocessor, a transmit output power, at which the UE can meet the one ormore transmit emission limit requirements and the one or more maximumtransmit power requirements. For example, in an aspect, processor 103executing coexistence transmission management component 13 and/ortransmit output power configuration component 36 is operable toconfigure transmit output power value 38 to meet the one or moretransmit emission limit requirements and the one or more maximumtransmit power requirements. In an aspect, the coexistence transmissionmanagement component 13 and/or transmit output power configurationcomponent 36 may use a backoff from a maximum output power less than orequal to the allowed maximum transmit output power reduction or backoff,at which UE 12 can meet the emission requirements (See FIG. 3, example1). In an alternative or additional aspect, the total power backoffallowance for UE 12 is a sum of a maximum power reduction (MPR; e.g., asdefined by an LTE specification)+an additional MPR (A-MPR; as defined byan LTE specification)+the allowed maximum transmit output powerreduction or backoff (as defined herein) (See FIG. 3, example 2). Theprocessor 103 executing coexistence transmission management component 13and/or transmit output power configuration component 36 may be operableto set the transmit output power to a value greater than or equal to amaximum output power minus the total power backoff allowance.

Further, at block 212, method 200 may optionally include transmitting asignal at the transmit output power value. For example, in an aspect,transceiver 106 and/or transmitter 134 may transmit a signal usingtransmit output power value 38. Transceiver 106 and/or transmitter 1354may control RF front end 104 and/or PA(s) 145 to transmit the signal thetransmit output power value.

Thus, UE 12 implementing method 200 may dynamically adjust transmissioncharacteristics to meet highly localized and quickly changingtransmission emission requirements, such as may be associated with a UEoperating in an ITS system having CEN DSRC RSU 14 with one or morecoexistence modes 34.

FIG. 3 is a graph 300 of power versus operational mode with respect toapplying an allowed maximum transmit output power reduction or backoff302 in one implementation of a wireless communication system, forexample, at a UE 12. The allowed maximum transmit output power reductionor backoff 302 may be used to determine a transmit output power 304 atwhich the UE 12 can meet the one or more emission requirements.

The UE 12 may be configured with a maximum output power 310. The maximumoutput power 310 may be a preconfigured output power at which the UE 12may operate. The maximum output power 310 may include a toleranceindicating an acceptable range over which a transmitter may operate whenconfigured to output at the maximum output power 310. The UE 12,however, may not always transmit at the maximum output power 310.

For example, in a normal mode 320, the UE 12 may be subject to variousregulations. For instance, a maximum power reduction (MPR) 322 mayspecify an allowed decrease in the maximum power transmitted in order toenable the UE 12 to pass transmitter adjacent channel leakage ratiorequirements. The MPR 322 may be used, for example, to enable the UE 12to allow various components (e.g., PAs 145) to operate in a linearregion. The Additional Maximum Power Reduction (A-MPR) 324 may be usedto comply with regional regulatory emissions requirements. For example,the A-MPR 324 may be based on an NS value signaled by the network entity44. The UE 12 may apply the MPR 322 and the A-MPR 324 to the maximumoutput power 310 to determine a transmit output power 326 that satisfiesthe transmitter adjacent channel leakage ratio requirements and theregional regulatory emissions requirements.

In another aspect, in a coexistence mode 330, the UE 12 mayalternatively or additionally apply the allowed maximum transmit outputpower reduction or backoff 302 302. For instance, in example 1, the UE12 may configure a transmit output power 304, using a backoff 306 frommaximum output power 310. The backoff 306 may be less than or equal tothe allowed maximum transmit output power reduction or backoff 302. Incases where the MPR 322 and the A-MPR 324 are applied, e.g., in acoexistence mode, the backoff 306 may be applied alternatively or inaddition to any backoffs associated with the MPR 322 and/or the A-MPR324. In example, 2, a total backoff 308 may be a combination of the MPR322, the A-MPR 324, and the allowed maximum transmit output powerreduction or backoff 302 302. For example, the total backoff 308 may bea sum of the MPR 322, the A-MPR 324, and the allowed maximum transmitoutput power reduction or backoff 302.

Several aspects of a telecommunications system have been presented withreference to an LTE/LTE-A or a 5G communication system. As those skilledin the art will readily appreciate, various aspects described throughoutthis disclosure may be extended to other telecommunication systems,network architectures and communication standards.

By way of example, various aspects may be extended to othercommunication systems such as High Speed Downlink Packet Access (HSDPA),High Speed Uplink Packet Access (HSUPA), High Speed Packet Access Plus(HSPA+) and TD-CDMA. Various aspects may also be extended to systemsemploying Long Term Evolution (LTE) (in FDD, TDD, or both modes),LTE-Advanced (LTE-A) (in FDD, TDD, or both modes), CDMA2000,Evolution-Data Optimized (EV-DO), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra-Wideband (UWB),Bluetooth, and/or other suitable systems. The actual telecommunicationstandard, network architecture, and/or communication standard employedwill depend on the specific application and the overall designconstraints imposed on the system.

Several aspects of telecommunication systems have been presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, modules, components,circuits, steps, processes, algorithms, etc. (collectively referred toas “elements”). These elements may be implemented using electronichardware, computer software, or any combination thereof. Whether suchelements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented with a “processing system”that includes one or more processors. Examples of processors includemicroprocessors, microcontrollers, digital signal processors (DSPs),field programmable gate arrays (FPGAs), programmable logic devices(PLDs), state machines, gated logic, discrete hardware circuits, andother suitable hardware configured to perform the various functionalitydescribed throughout this disclosure. One or more processors in theprocessing system may execute software. Software shall be construedbroadly to mean instructions, instruction sets, code, code segments,program code, programs, subprograms, software modules, applications,software applications, software packages, routines, subroutines,objects, executables, threads of execution, procedures, functions, etc.,whether referred to as software, firmware, middleware, microcode,hardware description language, or otherwise.

Accordingly, in one or more aspects, the functions described may beimplemented in hardware, software, firmware, or any combination thereof.If implemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can compriseRAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic diskstorage or other magnetic storage devices, or any other medium that canbe used to carry or store desired program code in the form ofinstructions or data structures and that can be accessed by a computer.Disk and disc, as used herein, includes compact disc (CD), laser disc,optical disc, digital versatile disc (DVD), and floppy disk where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Combinations of the above should also be includedwithin the scope of computer-readable media. In some aspects, thecomputer-readable media may be non-transitory or include anon-transitory computer-readable storage medium.

It is to be understood that the specific order or hierarchy of steps inthe methods disclosed is an illustration of exemplary processes. Basedupon design preferences, it is understood that the specific order orhierarchy of steps in the methods may be rearranged. The accompanyingmethod claims present elements of the various steps in a sample order,and are not meant to be limited to the specific order or hierarchypresented unless specifically recited therein.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language of the claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. A phrase referring to“at least one of” a list of items refers to any combination of thoseitems, including single members. As an example, “at least one of: a, b,or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, band c. All structural and functional equivalents to the elements of thevarious aspects described throughout this disclosure that are known orlater come to be known to those of ordinary skill in the art areexpressly incorporated herein by reference and are intended to beencompassed by the claims. Moreover, nothing disclosed herein isintended to be dedicated to the public regardless of whether suchdisclosure is explicitly recited in the claims.

What is claimed is:
 1. A method of managing transmissions of a userequipment (UE), comprising: determining, by a processor of the UE, thatthe UE is in a protection zone where additional transmissionrequirements apply, the additional transmission requirements includingone or more transmit emission limit requirements and one or more maximumtransmit power requirements enabling coexistence with one or more othercommunication systems in the protection zone; identifying, by theprocessor and based on being in the protection zone and a coexistencemode, one or more transmit emission limit requirements to be met;identifying, by the processor and based on being in the protection zoneand the coexistence mode, one or more maximum transmit powerrequirements to be met; determining, by the processor and based on theone or more transmit emission limit requirements and the one or moremaximum transmit power requirements, an allowed maximum transmit outputpower reduction to be utilized by the UE to meet the one or moretransmit emission limit requirements and the one or more maximumtransmit power requirements; and configuring, by the processor, atransmit output power, at which the UE meets the one or more transmitemission limit requirements and the one or more maximum transmit powerrequirements, wherein configuring the transmit output power includesusing a backoff from a maximum output power, wherein the backoff is lessthan or equal to the allowed maximum transmit output power reduction. 2.The method of claim 1, wherein determining that the UE is in theprotection zone where the additional transmission requirements apply isbased on additional information provided by a serving eNodeB.
 3. Themethod of claim 1, wherein determining that the UE is in the protectionzone where the additional transmission requirements apply is based onadditional information preconfigured in the UE.
 4. The method of claim1, wherein determining that the UE is in the protection zone where theadditional transmission requirements apply is based on additionalinformation received from a device of the one or more othercommunication systems.
 5. The method of claim 1, wherein a total powerbackoff allowance for the UE is a combination of a maximum powerreduction (MPR), an additional MPR (A-MPR), and the allowed maximumtransmit output power reduction.
 6. The method of claim 5, whereinconfiguring the transmit output power comprises setting the transmitoutput power to a value greater than or equal to the maximum outputpower minus the total power backoff allowance.
 7. The method of claim 1,further comprising determining the coexistence mode based on an intendedtransmission satisfying a time off requirement of the coexistence mode.8. The method of claim 1, wherein determining, by the processor of theUE that the UE is in the protection zone includes determining that ageo-location of the UE is within the protection zone.
 9. The method ofclaim 1, further comprising transmitting a signal at the transmit outputpower value.
 10. A user equipment (UE) for wireless communications,comprising: a transceiver; a memory configured to store instructions;and one or more processors communicatively coupled with the transceiverand the memory, wherein the one or more processors are configured to:determine that the UE is in a protection zone where additionaltransmission requirements apply, the additional transmissionrequirements enabling coexistence with one or more other communicationsystems in the protection zone; identify, based on being in theprotection zone and a coexistence mode, one or more transmit emissionlimit requirements to be met; identify, based on being in the protectionzone and the coexistence mode, one or more maximum transmit powerrequirements to be met; determine, based on the one or more transmitemission limit requirements and the one or more maximum transmit powerrequirements, an allowed maximum transmit output power reduction to beutilized by the UE to meet the one or more transmit emission limitrequirements and the one or more maximum transmit power requirements;and configure a transmit output power, at which the UE meets the one ormore transmit emission limit requirements and the one or more maximumtransmit power requirements using a backoff from a maximum output power,wherein the backoff is less than or equal to the allowed maximumtransmit output power reduction.
 11. The UE of claim 10, wherein the oneor more processors are configured to determine that the UE is in theprotection zone where the additional transmission requirements applybased on additional information provided by a serving eNodeB.
 12. The UEof claim 10, wherein the one or more processors are configured todetermine that the UE is in the protection zone where the additionaltransmission requirements apply based on additional informationpreconfigured in the UE.
 13. The UE of claim 10, wherein the one or moreprocessors are configured to determine that the UE is in the protectionzone where the additional transmission requirements apply based onadditional information received from a device of the one or more othercommunication systems.
 14. The UE of claim 10, wherein a total powerbackoff allowance for the UE is a combination of a maximum powerreduction (MPR), an additional MPR (A-MPR), and the allowed maximumtransmit output power reduction.
 15. The UE of claim 14, wherein the oneor more processors are configured to set the transmit output power to avalue greater than or equal to the maximum output power minus the totalpower backoff allowance.
 16. The UE of claim 10, wherein the one or moreprocessors are configured to determine the coexistence mode based on anintended transmission satisfying a time off requirement of thecoexistence mode.
 17. The UE of claim 10, wherein the one or moreprocessors are configured to determine that the UE is in the protectionzone based on determining that a geo-location of the UE is within theprotection zone.
 18. The UE of claim 10, wherein the transceiver isconfigured to transmit a signal at the transmit output power value. 19.A user equipment (UE) for wireless communications, comprising: means fordetermining that the UE is in a protection zone where additionaltransmission requirements apply, the additional transmissionrequirements enabling coexistence with one or more other communicationsystems in the protection zone; means for identifying, based on being inthe protection zone and a coexistence mode, one or more transmitemission limit requirements to be met; means for identifying, based onbeing in the protection zone and the coexistence mode, one or moremaximum transmit power requirements to be met; means for determining,based on the one or more transmit emission limit requirements and theone or more maximum transmit power requirements, an allowed maximumtransmit output power reduction to be utilized by the UE to meet the oneor more transmit emission limit requirements and the one or more maximumtransmit power requirements; and means for configuring a transmit outputpower, at which the UE meets the one or more transmit emission limitrequirements and the one or more maximum transmit power requirements,wherein the means for configuring the transmit output power isconfigured to use a backoff from a maximum output power, wherein thebackoff is less than or equal to the allowed maximum transmit outputpower reduction.
 20. The apparatus of claim 17, wherein the means fordetermining whether the additional transmission requirements apply isbased on additional information that is at least one of: provided by aserving eNodeB, preconfigured in the UE, or received from a device ofthe one or more other communication systems.
 21. The apparatus of claim19, wherein a total power backoff allowance for the UE is a combinationof a maximum power reduction (MPR), an additional MPR (A-MPR), and theallowed maximum transmit output power reduction.
 22. The apparatus ofclaim 21, wherein the means for configuring the transmit output power isconfigured to set the transmit output power to a value greater than orequal to the maximum output power minus the total power backoffallowance.
 23. A non-transitory computer-readable medium, comprisingcode executable by one or more processors to configure a transmit outputpower of a user equipment (UE), comprising code to: determine that theUE is in a protection zone where additional transmission requirementsapply, the additional transmission requirements enabling coexistencewith one or more other communication systems in the protection zone;identify, based on being in the protection zone and a coexistence mode,one or more transmit emission limit requirements to be met; identify,based on being in the protection zone and the coexistence mode, one ormore maximum transmit power requirements to be met; determine, based onthe one or more transmit emission requirements, an allowed maximumtransmit output power reduction to be utilized by the UE to meet the oneor more transmit emission requirements; and configure a transmit outputpower, at which the UE meets the one or more transmit emission limitrequirements and the one or more maximum transmit power requirements,wherein the code to determine the transmit output power, includes codeto use a backoff from a maximum output power, wherein the backoff isless than or equal to the allowed maximum transmit output powerreduction.
 24. The non-transitory computer-readable medium of claim 23,further comprising code to determine whether the additional transmissionrequirements apply based on additional information that is at least oneof: provided by a serving eNodeB, preconfigured in the UE, received froma device of the one or more other communication systems.
 25. Thenon-transitory computer-readable medium of claim 24, wherein a totalpower backoff allowance for the UE is a combination of a maximum powerreduction (MPR), an additional MPR (A-MPR), and the allowed maximumtransmit output power reduction.
 26. The non-transitorycomputer-readable medium of claim 25, further comprising code to set thetransmit output power to a value greater than or equal to the maximumoutput power minus the total power backoff allowance.